you do this :
in your front viewport you select :: Panel > Orthographic > New > Front
Then you :: View > Select Camera
And finaly you :: Change Translate Z to be = -100, and finaly Rotate Y = 180
If you like You can rename the camera from Front1 to Back.
I hope you understand, Good luck.
Carsten Lind
Senior 3D Artist,
Maya Software Manager & Maya Instructor
LEGO Systems A/S